Heat-exchange apparatus



June24, 1930. G. c. DERRY 1,765,970

HEAT EXCHANGE APARATUS original Filed July 6, 1925 2 sheetsshee 1 n. O 2l LILIULIIILIUULIUULILILI 35 n ummm* s lz 2 J0 l 12 5 f5 Ingenta ma@ #mii June 24, 1930. Q Q DERRY 1,765,970 v HEAT EXCHANGE APPARATUS y Original Filed July 6. 1925 2 sheets-sheet 2 w www Patented Ju' 24, 1930 UNITED STATES PATENT OFFICE emmene. DERBY, or SHARON, MASSACHUSETTS, Assnmon 'ro n. r. sTUa'rEvAN'r COMPANY, F HYDE PARK, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS lHEAT-IEXCHANGE APPARATUS Application led July 6?, 1925, Serial No. 41,493. Renewed January 11, 1929.

The present\ invention relates to heat exchange apparatus, such, for example, as

- fuel economizers for heating feed water 4 changers have been found objectionable because of their inability to 'withstand safely the high pressures, their bulky constructlon,

and the diilicultyof replacing defectivel parts.

It is the object of the present invention to provide a form of heat' exchan e apparatus which is particularly adapted or steel construction, thereby to withstand the high.

pressures incident to modern practice.

A .further object is to provide an economizer which shall be compact in construction yet of high capacity and fleiciency in operation.

Still another object of the present invention is to provide apparatus of the above described type which 'not only may 'be easily and quickly installed, but which, should any of its parts prove defective or become dama. ed. may be repaired with a minimum loss o? time and at small expense.

With these objects in view the present invention consists of the heat exchange apparatus herein described and more particularly defined in the claims. v

In the accompanying drawing which illustrate what is now considered the preferred form of the present invention as embodied in a fuel economizer, Figure 1 is aside elevation with portions o the outer casing broken away to show the economizer construction in elevation; Fig. 2 is a plan view, partly in section, on line 2-2 of Fig. 1; Fig. 3 is a front elevation showing the stack and the economizer casing with the doors of the latter opened and a portion of one of the headers broken away; and spective view of a detached section of the economizer. v

In the construction illustrated in the drawings the'economizer is of the horizontal tube type and is mounted ina verticalsection vof the stack or iiue 5. The economizer Fig. 4- is a perv ing spaced thereon disks or flanges 9. The

headers 6 and 7 are of forged or cast steel and the tubes 8 are of steel, thus providing a structure of great stren thwhich can successfully withstand the hlgh pressures now commonly used.' The flanges 9 may be 50 mountedK upon the tubes in any suitable manner, as Iby shrinkin the flanges upon the tubes or expanding t e tubes within the .anges The tubes are secured in the headers by being expanded therein,'suitable openings being formed in the headers to permit the passage of an expanding tool. As shown in Fig. 2, these openin s for the expanding tool are closed by p ugs sleeves or gaskets 12.

The economizer sections are arran ed one above the other in the flue 5 which orms a casing for the sections and serves to confine the hot gases passing from th furnace to the chimney. The inlet and the outlet openings 14 and l5 of adjacentv headers are con y nected by means of the return bends 17. The front header 6 has the middle partition 18 which divides the header into an inlet'and.80

return bend 17 to the next adjacent section. 90

The feed water enters the economizer through the yinlet-pipe 2O and leaves the economizerthrough the outlet pipe 21, the direction of iow of -the feed water being downwardly and the opposite of the flow of the gases which rise through the stack 5.

The economizer sections are supported upon the angle iron guides or supports 23, which are bolted at their ends to the vertical channel or U-sections 24, the headers 10 11 and copper 7 of each section resting with their lateral extremities on its angle iron supports.

Where the. tubes are of considerable length it may be desirableto provide a middle support for the same, such as is shown in Figs. 1 and 2, in the form of a section of channel iron, the extremities of which rest upon the supports 23, and the tubes restin upon the top of the sides of the channel. strap 26 with a depending shank and nut clamps the channel iron securely in position against the tubes.

Preferably the tubes of the sections are oii'set slightly toward one side, as shown in Fig. 4. By reversing, (i. e. turning up side down) alternate sections, the offset of the tubes will be iirst to one side and then to the other, producing a staggered arrangement of the tubes which increases the eiiciency of the apparatus.

In the preferred construction shown in the drawings all the connections between the adjacent economizer sections and between the .economizer andinlet and outlet pi es are at the front of the economizer, so t at the back and sides of the apparatus may be conveniently closed by walls 30 and the heat insulating4 material 31, all joints being lapped to prevent leakage.` The front of the economizer is provided with hinged doors 33 havin inner and outer walls 34 and 35, with the eat insulating material 36 between them. In order to secure a tight joint between the pivoted doors and the stationary casing, the outer walls 35 of the doors are extended beyond the margin of insulating material 36 and the inner wall 34, covering the joint between these parts and the casing thus preventing, or at least reducing, the leakage of air or gas at this point.

It will be seen that between the inlet chamber of the front header and the rear header and also between the rear header and the outlet chamber of the front header, a plurality of parallel paths of liquid flow are provided. Inasmuch as the inlet and outlet connections 14 and 15 are spaced from the partition 18 a distance which is at least as great as the spacing of the outside tubes from the partition, all possible paths of parallel fluid flow include approximately .the same length of headers and the same length of tubes. Uniform resistance of fluid flow and consequent equal division of fluid in the lseveral parallel paths are assured.

A soot cleaner is provided in the form of a steam pipe 38 which enters the economizer casing through the rear wall and which has a plurality of outlet openings 39. This steam pipeis connected in a suitable manner for angular movement so that the ste'am may be directed against the different tubes to blow oil the accumulation of soot and dust.

Since each section is a complete unit, these sections may beassembled at any convenient,

place and if desired there tested to disclose any hidden defects or weakness. In erecting the complete economizer it is only necessary to slide each section in from the front through the open doorway, the angular supports 23 providing a support and guide for the rear header and the intermediate channel support during such rearward movement.

After the sections are in place within the economizer casing, the return bends and the inlet and outlet connections may be attached, thereby completing the assembly.

In case a tube or header of any section should become damaged or should prove defective, lit will require but a short time to substitute'another section as it will be necessary only to disconnect the return blades on the two sections adjacent the defective section, thereby permitting that section to be withdrawn and a new section slid into its place. The damaged section may then be repaired at leisure.

Owing to the steel construction with its thinner walls and to the increased surface afforded by the flanges or disks, not only a more compact apparatus is provided but greater capacity andy efliciency secured, thus enabling the apparatus to be installed where the limited space would prevent the use of the more cumbersome types heretofore employed.

Preferably the sections are protected from corrosion both within and without by means of'a lead coating applied to each tube and header separately before assembling.

While the present invention has been shown and described as embodied in a fuel economizer of the horizontal tube type, it is to be understood that the present invention is not limited either to such apparatus or to such type but may be embodied in other kinds of types of heat exchange apparatus within the limits defined in the claims.

Having described the invention, what is claimed is:

1. Heat exchange apparatus comprising a plurality of sections each consisting of a front and a rear header, the front header having separated inlet and outlet chambers, and of conductors between said chambers and the rear header, and connections between the inlet chamber and the outlet chamber of adjacent front headers.

2. I-Ieat exchange apparatus comprising a plurality of sections each consisting of a front and a rear header, the front header having separated inlet and outlet chambers, and of conductors between the said chambers and the rear header, connections between the inlet and outlet chamber of the front headers of adjacent sections. a casing for the sections, and means for supporting the sections in normal position in the casing andv for supporting and guiding the same when being removed or replaced.

3. Heat exchange apparatus comprising a plurality of sections each consisting of front and rear headers and of conductors between the headers, connections between adjacent headers, a casin for the sections, and longitudinally exten ing members for the casing for supporting and guiding the headers during removal and replacement of the sections.

4. Heat exchange apparatus comprisin a prlurality of sections each consisting o a on't and a rear header, of conductors between the headers, and of a transverse support for the conductors, a casing and longi-I tudinally disposed angle iron members on the casing and engaging the headers and the transverse support adjacent their extremities for supporting the sections in normal position and for supporting and guiding the same during removalA and replacement.

5. Heat exchange apparatus comprising a flue for4 hot gases having rigidly connected insulated sides and back, an insulated door for the front, a plurality of sections within the iiue each consisting of a front and a rear header and conductors between the headers, connections .between the front headers of adjacent sections, and lateral guides adjacent the sides of the flue for supporting and guiding the headers and sections to permit removal and replacement of any sectlon from ther front of the flue.

6. Heat exchange apparatus comprisin a plurality ofsections each consisting oa front and a rear header, the front header having separated inlet and outlet chambers, and of conductors between said chambers and the rearheader, the conductors of adjacent sections being staggered and having flanges -ixed thereon, connections between the inlet and outlet chambers of adjacent front. headers, a casing and means for supporting "the sections in the c-asinghaving provision for the removal and replacement thereof from the front.

7 A section for heat exchange apparatus comprising a front and a rear header, the front header having inlet and outlet openings, and a pluralit of tubes between the headers, the tubes be1ng oifset laterally, with respect to the ends of the headers, whereby identical sections maybe placed alternately in reversed order to produce a staggered tube arrangement 8. A section for heat exchange apparatus as defined in claim 7 in which the front header is provided with separated inlet and outlet chambers.

9. Heat exchange apparatus comprising a plurality of sections each consisting of a front header yand a rear header and conductors between the headers, connections between adjacent front headers, and means for independently supporting each section having provision for supporting and guiding a section being removed from proximity to other sections.

10. Heat exchange apparatus comprising a plurality of sections each consisting of a divided front header and a rear header, a conductor, conductors between the headers, and a transverse support for the conductors, a casing, longitudinally disposed angle iron members on the casing and engaging the headers and the transverse support for suporting the sections in normal position tand or supporting and guiding the same during removal and replacement, and inlet and outlet connections extending between -and connecting front headers of dierent sections.

11. Heat exchange apparatus comprising a plurality of horizontal sections each consisting of a front header and a rear header and conductors between the headers, each conductor having anges fixed thereon,l a casing, longitudinally extending members at the sides of the casing on which the sidesof the sections rest, whereby each section is independently supported in normal position and is supported and guided while being removed or replaced, a transverse support for the conductors intermediate the headers and consisting of a channel engaging with the conductors but out of contact with the flanges, the support restin upon the longitudinally extending members.

12. A section for heat exchange apparatus comprisin a front header and arear header, tubes at its ends etween the headers, the section having inlet and outlet connection J openings, the tubes being spaced substantially equal distancesapart with the outer tube on one side of the section located nearer the ends of the headers than is the outerY tube 4on the other side of the section so that lby arranging alternate sections in inverted relationship, the tubes will be staggered in the apparatus.

13. Heat exchange apparatus comprising a plurality of sections, each section comprlsing a front header and a rear header and a plurality of tubes connecting the headers, a casing, longitudinally extending members within the'casing on which'the sides of the sections rest, and connections between headers of dierent sections, the sections and connections being located entirely withverted in the apparatus to stagger the tubes,

and connections between headers of the` sections, the sections and connections being located'entirely within the casing.

15. A section for heat exchange apparatus comprising a front header and a rear header` and tubes connecting the headers, a

casing, longitudinally extending members at the sides of the casing on which the sides of the sections rest, one of the headers having inlet and outlet connection openlngs to permit connections to be made to headers of adjacent sections at one end of the apparatus.

16. Heat exchange apparatus comprising a casing, a plurality of sections supported in the casing, each section consisting of two headers and tubes between the headers, the sections being arranged in groups with spaces between the groups, and a soot blower in the space between adjacent groups.

17. Heat exchange apparatus comprising a plurality of groups of sections, each section consisting of two headers and tubes connecting the headers, the tubes having transverse extended surface flanges, and a soot blower between adjacent groups of sections to direct steam jets transversely of the tubes.

In testimony whereof I have signed my lname to this specification.

GARDNER C. DERRY. 

